/*
 * Copyright (C) 2008 Universidade Federal de Campina Grande
 *  
 * This file is part of OurGrid. 
 *
 * OurGrid is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free 
 * Software Foundation, either version 3 of the License, or (at your option) 
 * any later version. 
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details. 
 * 
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package org.ourgrid.worker.receiver;

import org.ourgrid.common.interfaces.management.RemoteWorkerManagement;
import org.ourgrid.common.interfaces.management.RemoteWorkerManagementClient;
import org.ourgrid.common.interfaces.to.WorkerStatus;
import org.ourgrid.reqtrace.Req;
import org.ourgrid.worker.WorkerConstants;
import org.ourgrid.worker.controller.ExecutionController;
import org.ourgrid.worker.controller.WorkerController;
import org.ourgrid.worker.dao.WorkerStatusDAO;
import org.ourgrid.worker.messages.ControlMessages;
import org.ourgrid.worker.messages.RemoteWorkerManagementControllerMessages;

import br.edu.ufcg.lsd.commune.api.FailureNotification;
import br.edu.ufcg.lsd.commune.api.InvokeOnDeploy;
import br.edu.ufcg.lsd.commune.api.MonitoredBy;
import br.edu.ufcg.lsd.commune.api.RecoveryNotification;
import br.edu.ufcg.lsd.commune.container.servicemanager.ServiceManager;
import br.edu.ufcg.lsd.commune.identification.DeploymentID;

/**
 * Performs Remote Worker Management actions
 */
@Req("REQ006")
public class RemoteWorkerManagementReceiver implements RemoteWorkerManagement {
	
	private static final long serialVersionUID = 1L;
	private ServiceManager serviceManager;

	@Req("REQ006")
	@InvokeOnDeploy
	public void init(ServiceManager serviceManager) {
		this.serviceManager = serviceManager;
	}
	
	/**
	 * @return the serviceManager
	 */
	protected ServiceManager getServiceManager() {
		return serviceManager;
	}
	
	@Req("REQ121")
	public void workForBroker(
			@MonitoredBy(WorkerConstants.REMOTE_WORKER_MANAGEMENT)RemoteWorkerManagementClient remotePeer, 
			String brokerPubKey) {
		
		DeploymentID brokerID = getServiceManager().getStubDeploymentID(remotePeer);
		String senderPublicKey = getServiceManager().getSenderPublicKey();
		
		if (!senderPublicKey.equals(brokerID.getPublicKey()) || 
				!senderPublicKey.equals(getWorkerStatusDAO().getRemotePeerPublicKey())) {
			getServiceManager().getLog().warn(
					RemoteWorkerManagementControllerMessages.getUnknownPeerSendsWorkForMyGridMessage(senderPublicKey));
			return;
		}
		
		if (getWorkerStatusDAO().isAllocated()) {
			preemptWorker();
		}
		
		if (getWorkerStatusDAO().getStatus().equals(WorkerStatus.ALLOCATED_FOR_PEER)) {
			getServiceManager().getLog().debug(ControlMessages.getWorkerStatusChangedMessage(
					WorkerStatus.ALLOCATED_FOR_PEER, WorkerStatus.ALLOCATED_FOR_BROKER));
		}
		
		getServiceManager().getLog().info(RemoteWorkerManagementControllerMessages
				.getRemotePeerCommandedWorkerToWorkForMyGridMessage(brokerPubKey));
		
		if (getWorkerStatusDAO().getConsumerPublicKey() != null) {
			if (getServiceManager().getObjectDeployment(WorkerConstants.WORKER) != null) {
				getServiceManager().undeploy(WorkerConstants.WORKER);
			}	
		}
		
		getWorkerStatusDAO().setStatus(WorkerStatus.ALLOCATED_FOR_BROKER);
		getWorkerStatusDAO().setRemotePeerConsumer(remotePeer);
		getWorkerStatusDAO().setConsumerPublicKey(brokerPubKey);
		
		ExecutionController.getInstance().beginAllocation(getServiceManager());
		
	}
	
	private void preemptWorker() {
		WorkerController.getInstance().interruptWorking(getServiceManager(), false);
	}

	private WorkerStatusDAO getWorkerStatusDAO() {
		return getServiceManager().getDAO(WorkerStatusDAO.class);
	}
	
	@RecoveryNotification
	public void workerManagementClientIsUp(RemoteWorkerManagementClient rwmc) {}
	
	@FailureNotification
	public void workerManagementClientIsDown(RemoteWorkerManagementClient rwmc) {}

}